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Welcome to the Community, I'm very sorry to learn about the problems with your TiVo box.
As PrinterElf has mentioned, we'd love to get some more information about the sound you're hearing, when you're hearing it, how long it lasts for and if it happens at certain times of the day or on certain channels.
Additionally, are you using any audio equipment or do you have the TiVo plugged directly to the TV using the HDMI cable and the audio coming through that?
Apologies again for these issues, we're looking forward to hearing from you